Plumbing tool



FIG. 1 is a perspective view of a plumbing tool showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left end view thereof; and,

FIG. 5 is a right end view thereof. 

The ornamental design for a plumbing tool, as shown. 